Interior architecture is where spatial clarity meets refined materiality – it’s the art of shaping how a home feels as well as functions. At Armstrong Simmonds Architects, we bring the same level of care to interiors as we do to the architecture, ensuring every detail aligns with the design vision.
Based in South West London, our architect studio delivers bespoke interior architecture and specification schedule services that help elevate homes with high-quality finishes, integrated joinery, and coherent material palettes. Whether you’re designing a new-build or transforming an existing property, our approach helps deliver spaces that are both timeless and tailored.
Whilst they overlap and are very closely linked, there are differences between the two for the purposes of our services: Interior architecture involves the joinery, glazing, finishes, lighting and technical drawing; whilst interior design focuses on furniture, fittings, colours, and decorative styling.
Interior architecture brings precision and intent to room layouts, lighting, joinery, and material combinations, making sure every detail supports the way you move, live, and feel at home. Having the vision conveyed clearly not only means the project is delivered as intended, but also that the contractors and specialists can understand who is responsible for the purchase or installation of specific items. Interior architecture schedules provide the framework to allow this to happen, setting out clear lines of responsibility and specification.
With over 15 years of experience in high-end residential design, our team understands how to deliver well-resolved projects that are both elegant and practical. Here’s why clients choose us:
Integrated Design Thinking – Our architectural services are fully connected, meaning interiors are considered from the early concept stages.
Attention to Detail – We develop room-by-room documentation that includes finishes, materials, bespoke joinery, and lighting features.
Material and Finish Expertise – From natural stone and specialist glazing to contemporary timber panelling, we understand how to create depth and richness through material choices.
Coordinated Drawings and Schedules – Our schedules form part of the construction documentation, enabling accurate pricing and clarity for contractors.
Our process is designed to seamlessly transition from exterior architecture to a beautifully crafted interior:
Early in the project, we begin developing spatial layouts that reflect how each room will be used. We consider circulation, storage needs, natural light, and spatial hierarchy – all tailored to your lifestyle.
We design key bespoke elements such as kitchen layouts, wardrobes, media units, bookcases, staircases, and other joinery pieces. These are drawn to scale and coordinated with the architectural set and necessary specialists.
We work with clients to select a cohesive palette of finishes and materials, including flooring, wall treatments, tiles, worktops, and decorative elements. Our goal is to create a unified and enduring aesthetic.
We produce detailed interior schedules including:
These schedules support accurate cost planning and ensure the builder delivers the correct items onsite.
Ideally, interior architecture should be developed alongside the architectural design and at least once technical stages commence. This allows for a cohesive result and avoids needing to retrofit decisions later in the process.
An interior architecture schedule is a detailed document that sets out the materials, finishes, fittings, and components to be used in the project – as well as who is supplying and installing them. It supports clear coordination with the contractor and ensures that the built interior aligns precisely with the design intent.
Yes. We’re happy to collaborate with your chosen interior designer, or to provide a complete interior specification service ourselves as part of our broader architectural services.
